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A-740003 prevented lung fibrosis in pulmonary arterial hypertension. Masson trichrome staining for collagen in the lung tissue of the sham group (a), P/MCT group (b), P/MCT + CA group (c), and P/MCT + DA group (d). Original magnification × 20. Scale bar = 50 μm for all images. All values are the mean ± SD, n = 6. *p < 0.05 compared with the sham group; †P < 0.05 compared with the P/MCT vehicle group
